Cuantos metros de encaje se necesita para el borde del un mantel circular que tiene 50 cm de radio

157 cm

Step-by-step explanation:

El valor que se necesita para el borde del mantel es equivalente al perímetro del mantel.

Para un circulo de 50 cm de radio, el perímetro es:

Se necesitan 157 cm de encaje.

The value needed for the edge of the tablecloth is equivalent to the perimeter of the tablecloth.

For a circle with a radius of 50 cm, the perimeter is:

157 cm of lace are required.

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)